| 摘要 |
The present invention discloses a process for electroless plating of nickel onto copper features of a printed circuit board which suppresses extraneous nickel plating. The process comprises the steps i) activation of the copper features with palladium ions; ii) removal of excessive palladium ions or precipitates formed thereof with a pre-treatment composition comprising at least two different types of acids wherein one type is an organic amino carboxylic acid and iii) electroless plating of nickel. |
